Wireless power feeding transmission is now in demand in the various fields. Electrical products of this modern
age such as mobile phones, laptop monitoring sensors and electrical vehicles are spreading everywhere. Those electric
device need to feed frequently because amount of consumed electric power of those devices are gradually increasing.
Nonetheless content of battery show signs of leveling off. This is why it is important to develop a method of wireless
power transmitting system with high efficiency. Strongly coupled magnetic resonance is the latest type of wireless
power transmission technology. The main feature of this technology is the effectiveness in the mid-range that covers
many attractive applications. The theory of transmitting efficiency is derived as a function of impedance ratio r and RF
frequency ω.
A power beaming system to a Micro Aerial Vehicle (MAV) using 5.8GHz microwaves has been developed. The system
consists of three sub-systems; a pointing system, a tracking system, and a receiving system. The MAV is tracked using
the phase information of pilot signal. Software retro-directive function has been realized through a PC control and a
microwave beam is pointed to the MAV using an active phased array. The beam divergence was about 9deg and the
beam steering angle was from -9deg to +9deg. Light-weight flexible rectenna array made of cupper tapes and a thin
polyimide film was mounted on a wing of the MAV model, and the electric motor was driven by the received power.
The weight per unit reception area was 26mg/cm2.
For the purpose of constructing the design rules of air- breathing laser launcher, the expansion of plasma, which was produced from air by focusing pulse laser, was investigated. A 10-J-pulse TEA CO2 laser was used for these experiments. First, plasma was formed in a quiescent atmospheric air. Photographs and shadowgraphs were taken using an ICCD camera with high-speed gating. From the photographs, the propagation velocity along the laser axis was measured. The velocity was found around 104 m/s much higher than that of a detonation wave calculated using LSD model. Since laser intensity at the plasma front was below the threshold for LSD regime, absorption/expansion mechanism other than LSD might predominate under the experimental condition. Shadowgraphs were taken to measure the expansion velocity of plasma and that of shock wave around plasma. The flow facility, in which plasma is formed in Mach 2 stream, was presented.
Conference Committee Involvement (11)
High-Power Laser Ablation VIII
26 February 2024 | Santa Fe, New Mexico, United States
Nano-, Bio-, Info-Tech Sensors and 3D Systems
4 March 2019 | Denver, Colorado, United States
Nano-, Bio-, Info-Tech Sensors and 3D Systems
5 March 2018 | Denver, Colorado, United States
Nano-, Bio-, Info-Tech Sensors and 3D Systems
26 March 2017 | Portland, Oregon, United States
Nano-, Bio-, Info-Tech Sensors and Systems
21 March 2016 | Las Vegas, Nevada, United States
Nano-, Bio-, Info-Tech Sensors and Systems
9 March 2015 | San Diego, California, United States
Nano-, Bio-, Info-Tech Sensors and Systems
10 March 2014 | San Diego, California, United States
Nano-, Bio-, Info-Tech Sensors and Systems
10 March 2013 | San Diego, California, United States
Nano-, Bio-, Info-Tech Sensors and Systems
12 March 2012 | San Diego, California, United States
Nano-, Bio-, Info-Tech Sensors and Systems
7 March 2011 | San Diego, California, United States
Nano-, Bio-, Info-Tech Sensors and Systems
8 March 2010 | San Diego, California, United States
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